Improvement in automatic draft-regulators for steam-boilers



Z Sheets-Sheet1.

. A.C.NORCRS& AUTOMATIC DRAFT REGULATORS FOR STEAM BOILERS, &c. No. 190,354. Patented. May 1, 1877.

ATTORNEYS N. PEI'ERS, Pllord-LITHOGRAFHER, WASHINGTON D C 2. SheetsSheet 2.

A. C. NORCRDSS. AUTOMATIC DRAFT REGULATORS FQR,

STEAM B0ILERS,&0. Patented May 1, 1877 INVENTOR w ATTORNEYS NJEI'ERS, PHOTO-LITHOGRAFHEH. WASHINGTON. D C,

ALVIN o. NORGROSS, 0F i'sos'ron, MAssAonUsETTs.

IMPROVEMENT in" AUTOMATIC llRAFl-REGULATORS FORSTEAlVI-BOILERS. ac.

Specification forming part of Letters Patent No. l90,35 4,'-dated May 1, 1877 application filed- April 14,1877.

To all whom it may concern:

Be it known that I, ALVINO. Noacnoss,

ofBOston, in the county of Suffolk, and in the State. of Massachusetts,.hav.e invented.

certain new and useful Improvements in A1 1 tomatic Draft-Regulators for Steam-Boilers,

ings, and to the letters of reference marked thereon, making a part of this specification.

The nature of my inventionzconsistsinan' automatic pressure regulator or governor, voperated by-water from .the boiler, as will'be hereinafter more fully set forth.

' In order to enable others skilled'in the art to which my invention appcrtains to make and use the same, I will now proceed to de scribe "its construction and operation, referring to the annexed drawiugs,in which- Figure 1 is a front view of my invention. Fig. 2 is a longitudinal section of a part thereof and Figs. 3 and 4 are detailed views, showing detached parts of the same.

A represents a cylindrical casing of any suitable dimensions, which is to be made fast to a wall or other suitable support. In the center of this casing projects a horizontal arm, B,'having a longitudinal groove or bearing, a, in its upper side, as shown. On the front end of the casing A is placed a rim, O, provided with an annular flange, corresponding with, and loosely resting-against, the edge of said case, to allow for the lateral motion caused by the oscillation of the working-beam, and to which is fastened the cap D and this cap has a stem or arm, B, projecting inward from its center, forming the support or bearing of the beam and its attachments. On the under side of the stem or arm B are formed knife-edges b b, which rest in the groove or bearings a on the arm B, and on which the rim 0 can thus tilt from side to side. In the back of the casing A, and in the cap D, are formed segmental projections 01 d, which overlap the ends of the arms or stems B B, by which they are held in position.

From one side of the rim 0 projects a beam, E, which may be graduated or not, as desired, and on the end of this beam is formed or attached a weight, E preferably in ball form.

E represents amovablepoise on the. beam E, to be placed at any point desired, according to the pressureto be maintained, and fastened at such point by a set-screw, c, or otherwise.

From the opposite side of the rim 0, and in 1 the opposite direction from thebeam, extends a nection J is to be connected by a suitable pipe with the water-space of the boiler. 1

- Inthe vouter end ofthe, hollow arm 'G is screwed or otherwise connected a curved pipe,

' K, which lieswithin the air-chamber H, and

extends nearly to the bottom thereof, as shown inFig.4.

The air-chamber H is full of air, and should be made perfectly air and water tight.

The governor or regulator thus constructed being connected by means of the coil and hollow arm G with the water-space of the boiler, as described, the operation is as follows: Then the pressure in the boiler increases the water is forced by the steam into the coil 1, through the same, and through the hollow arm G and pipe Kinto the air-chamber H, compressing the air therein in the top of the chamber. As the pressure of the steam in the boiler decreases the water is forced back into the boiler from the air-chamber by the expansive force of the air previously compressed.

This is the principle upon which my regulator or governor operates The weight E on the beam E being set at a certain pressure, the airrchamber l:[ will remain up until the pressure in the boiler exceeds such amount; but at that time suflicient quantity of water has been forced from the boiler into said chamber to overbalance the weights on the opposite end of the beam, and hence the whole rim 0 tilts on its knifeedges, the air-chamber H dropping down the desired distance. The air-chamber H and weight E being, by rods h it, connected with .the dampers, of course such movement o en ates said dampers to decrease the heat in the furnace, and hence also the pressure in the boiler.

Then, as the pressure decreases, the air chamber H becomes lighter by the expansive force of the compressed air forcing back the water, and then the apparatus tilts again to its former position, reversing the dampers again, shutting or opening them, as the case may be.

This device may be applied in any Wayto regulate the steam-pressure, whether in the boiler itself, or in any apparatus connected with the boiler by connecting one or both arms of the apparatus with the necessary valves or cocks.

If from any cause the air should be exhausted from the chamber H, it can readily be resupplied by opening a stop-cock, L, in the bottom of the chamber, and another stop-cock, L, at the inner end of the arm G, and closing a cock in the water-supply pipe. The water in the air-chamber Will then pass out and air rush in to fill it. I I 1 It may also be applied for gaspressure, in which casea water-chamber Will be provided, and the water from said 'chamberforced into the air-chamber, this Water-chamber then takin g the place of the boiler.

The pipe I, being coiled in the casing A, forms a flexible oscillating conduit-joint, allowing the apparatus to work or vibrate easily Without friction.

In some cases I may attach the air-chamber to an arm pivoted independent of the rim, and by attaching said pivoted arm to a stationary arm by a spiral spring, or its equivalent, and by rack and pinion attach the movable arm to an indicator or pointer on a dial made fast to the stationary arm. By means of this device I am able to indicate correctly on the dial the changes in the weight of the air-chamber, which shows correctly the pressure in the boiler.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. An automatic draft-regulator, operated bywater forced from the boiler into an airchamber, and returned by the expansive force of the compressed air, constructed substantially as herein set forth.

2. The coil I, arranged within the casing A, and forming a flexible oscillating conduit-joint,

substantially as set forth.

3. The combination of the casing A, with grooved arm B, rim 0, cap D, with arm B, having knife-edges b b, and the overlapping projections or flanges d d, substantially as and for thepurposes herein set forth.

4. The curved pipe K, extending from the arm G to the bottom of the air-chamber H, in combination with the said chamber, arm, and the coil I, substantially as set forth.

5. The combination of the tilting rim 0, beam E, with weights, flexible-joint conduitpipe I, hollow arm G jand air-chamber H, substantially as and for the purposes herein set forth.

In testimony that I claim theforegoing I have hereunto set my hand this 13th day of April, 1877.

ALVIN O. NORGBOSS.

Witnesses:

FRANK GALT, J. M. MASON. 

